It wasn’t the if-
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The document describes a calculator application built using COSA technology. COSA uses rules and states to model applications as code. The calculator application contains rules for operands, operations, results and other states. It can subtract two negative numbers and produce a negative result by treating subtraction as negation. The application and its rules are then stepped through as an example of using COSA to build applications where the model and code are the same.
It wasn’t the if-
- 1. The Model is the Code Using COSA Technology by Gordon Morrison Copyright © 2012 All Rights Reserved 05/08/12 www.vsmerlot.com 1
- 2. It wasn’t the “go to” • The ‘if’ has caused more spaghetti code than the ‘go to’ ever could. 05/08/12 www.vsmerlot.com 2
- 3. Simple Calculator Example • Subtract two negative numbers resulting in a negative result. 05/08/12 www.vsmerlot.com 3
- 4. A COSA Solution • Rules – Operand1 – Operate – Operand2 – Result – Done – Error 05/08/12 www.vsmerlot.com 4
- 5. The Application • Five Functions – Add – Subtract – Multiply – Divide – Percent • Clear • Clear Entry 05/08/12 www.vsmerlot.com 5
- 6. On Subtract Event • Handled as Negate 05/08/12 www.vsmerlot.com 6
- 7. Run Engine 05/08/12 www.vsmerlot.com 7
- 8. Engine On 05/08/12 www.vsmerlot.com 8
- 9. Check Event State • Static State – Compared to • Dynamic State 05/08/12 www.vsmerlot.com 9
- 10. True Rule or Behavior • Dynamically bind to True Member 05/08/12 www.vsmerlot.com 10
- 11. Operand1 Rule • Step – Negate 05/08/12 www.vsmerlot.com 11
- 12. Rule’s True Behavior 05/08/12 www.vsmerlot.com 12
- 13. Single Point True Trace 05/08/12 www.vsmerlot.com 13
- 14. Trace what you want • Complex or • Simple 05/08/12 www.vsmerlot.com 14
- 15. Next Rule • Base on True 05/08/12 www.vsmerlot.com 15
- 16. Engine Off • Return to OS… 05/08/12 www.vsmerlot.com 16
- 17. Exit to OS 05/08/12 www.vsmerlot.com 17
- 18. Model • Model = Code • Code = Model 05/08/12 www.vsmerlot.com 18
- 19. Application 05/08/12 www.vsmerlot.com 19
- 20. Next On Click Event 05/08/12 www.vsmerlot.com 20
- 21. Back to Engine 05/08/12 www.vsmerlot.com 21
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- 24. Same Rule Next Step • Previous Step Allows – True Any Number – False One Period 05/08/12 www.vsmerlot.com 24
- 25. True Behavior 05/08/12 www.vsmerlot.com 25
- 26. Turn Engine Off 05/08/12 www.vsmerlot.com 26
- 27. Trace 05/08/12 www.vsmerlot.com 27
- 28. Next True Step 05/08/12 www.vsmerlot.com 28
- 29. Engine Off 05/08/12 www.vsmerlot.com 29
- 30. Return to OS 05/08/12 www.vsmerlot.com 30
- 31. Rule Operand1 Step Any Number • Model = Code • Code = Model 05/08/12 www.vsmerlot.com 31
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- 51. Number 05/08/12 www.vsmerlot.com 51
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- 53. Now Click Subtract 05/08/12 www.vsmerlot.com 53
- 54. Subtract • On Click Event 05/08/12 www.vsmerlot.com 54
- 55. Not Any Number • Next Step 05/08/12 www.vsmerlot.com 55
- 56. Not Any Number • Next Step 05/08/12 www.vsmerlot.com 56
- 57. Not Clear Entry 05/08/12 www.vsmerlot.com 57
- 58. Not Clear Entry 05/08/12 www.vsmerlot.com 58
- 59. Not Clear 05/08/12 www.vsmerlot.com 59
- 60. Not Clear 05/08/12 www.vsmerlot.com 60
- 61. Rule Operate • Not Step Addition 05/08/12 www.vsmerlot.com 61
- 62. Not Addition Step • Rule Operate 05/08/12 www.vsmerlot.com 62
- 63. Rule Operate • Step Subtract 05/08/12 www.vsmerlot.com 63
- 64. Rule Operate • Step Subtraction 05/08/12 www.vsmerlot.com 64
- 65. Next Rule • Operand 2 05/08/12 www.vsmerlot.com 65
- 66. First Step • Return to OS 05/08/12 www.vsmerlot.com 66
- 67. Subtracting 05/08/12 www.vsmerlot.com 67
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- 70. Rule Operand2 • Step Negate 05/08/12 www.vsmerlot.com 70
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- 74. A Negative Number 05/08/12 www.vsmerlot.com 74
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- 90. Then Click Equals 05/08/12 www.vsmerlot.com 90
- 91. On Click Equals 05/08/12 www.vsmerlot.com 91
- 92. Not Any Number Step 05/08/12 www.vsmerlot.com 92
- 93. Exit Rule Operand 2 05/08/12 www.vsmerlot.com 93
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- 95. Not Clear Entry • Etc. 05/08/12 www.vsmerlot.com 95
- 96. Result Rule • Not Percent Step 05/08/12 www.vsmerlot.com 96
- 97. Result Rule • Equals Step 05/08/12 www.vsmerlot.com 97
- 98. Result 05/08/12 www.vsmerlot.com 98